Through madCollection shell classes, I got those listing. All are computers on out network.
The GUID remains constant through Win2kPro(English), XP (Brazilian), XP Pro (English) and Vista Ultimate(Brazilian).
That behavior is from the madShell library or is Windoze thing? Would I get the same GUIDs on Win9x/ME/NT? (We don't have a machine with those OSes on our environment).